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Plot the peak frequency of a ShortTimeFourirer Transformation

Posted 2 years ago

Hi all,

I did the ShortTimeFourier(stf) Transformation of the following signal. enter image description here

And got the results as shown in this Spectrogram. enter image description here

Then I wanted to find the peak frequency of this each turn using PeakDetect as:

Qpeak = Table[PeakDetect[GaussianFilter[Abs[stf[[b]]["Data"][[turn]]], [Sigma]], [Sigma]/ 2, 0, qthreshold], {b, numpeaks}];

And plot it using MatrixPlot as below. enter image description here

As you can see, the right side of the plot is the mirror image of the left side.

So my question is that I couldn't figure out which side (left or right) shows the imaginary side of the amplitude and which side shows the real side?

Could you please help me with this? I appreciate any help you can provide.

POSTED BY: S Wije
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